app/src/main/java/net/ktnx/mobileledger/async/RetrieveTransactionsTask.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.async;
  19
  20 import android.annotation.SuppressLint;
  21 import android.database.sqlite.SQLiteDatabase;
  22 import android.os.AsyncTask;
  23 import android.os.OperationCanceledException;
  24 import android.util.Log;
  25
  26 import net.ktnx.mobileledger.err.HTTPException;
  27 import net.ktnx.mobileledger.json.AccountListParser;
  28 import net.ktnx.mobileledger.json.ParsedBalance;
  29 import net.ktnx.mobileledger.json.ParsedLedgerAccount;
  30 import net.ktnx.mobileledger.json.ParsedLedgerTransaction;
  31 import net.ktnx.mobileledger.json.TransactionListParser;
  32 import net.ktnx.mobileledger.model.Data;
  33 import net.ktnx.mobileledger.model.LedgerAccount;
  34 import net.ktnx.mobileledger.model.LedgerTransaction;
  35 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  36 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  37 import net.ktnx.mobileledger.ui.activity.MainActivity;
  38 import net.ktnx.mobileledger.utils.MLDB;
  39 import net.ktnx.mobileledger.utils.NetworkUtil;
  40
  41 import java.io.BufferedReader;
  42 import java.io.IOException;
  43 import java.io.InputStream;
  44 import java.io.InputStreamReader;
  45 import java.lang.ref.WeakReference;
  46 import java.net.HttpURLConnection;
  47 import java.net.MalformedURLException;
  48 import java.net.URLDecoder;
  49 import java.nio.charset.StandardCharsets;
  50 import java.text.ParseException;
  51 import java.util.ArrayList;
  52 import java.util.HashMap;
  53 import java.util.Stack;
  54 import java.util.regex.Matcher;
  55 import java.util.regex.Pattern;
  56
  57
  58 public class RetrieveTransactionsTask
  59         extends AsyncTask<Void, RetrieveTransactionsTask.Progress, String> {
  60     private static final int MATCHING_TRANSACTIONS_LIMIT = 50;
  61     private static final Pattern reComment = Pattern.compile("^\\s*;");
  62     private static final Pattern reTransactionStart = Pattern.compile("<tr class=\"title\" " +
  63                                                                       "id=\"transaction-(\\d+)\"><td class=\"date\"[^\"]*>([\\d.-]+)</td>");
  64     private static final Pattern reTransactionDescription =
  65             Pattern.compile("<tr class=\"posting\" title=\"(\\S+)\\s(.+)");
  66     private static final Pattern reTransactionDetails =
  67             Pattern.compile("^\\s+(\\S[\\S\\s]+\\S)\\s\\s+([-+]?\\d[\\d,.]*)(?:\\s+(\\S+)$)?");
  68     private static final Pattern reEnd = Pattern.compile("\\bid=\"addmodal\"");
  69     private WeakReference<MainActivity> contextRef;
  70     private int error;
  71     // %3A is '='
  72     private Pattern reAccountName = Pattern.compile("/register\\?q=inacct%3A([a-zA-Z0-9%]+)\"");
  73     private Pattern reAccountValue = Pattern.compile(
  74             "<span class=\"[^\"]*\\bamount\\b[^\"]*\">\\s*([-+]?[\\d.,]+)(?:\\s+(\\S+))?</span>");
  75     public RetrieveTransactionsTask(WeakReference<MainActivity> contextRef) {
  76         this.contextRef = contextRef;
  77     }
  78     private static void L(String msg) {
  79         //Log.d("transaction-parser", msg);
  80     }
  81     @Override
  82     protected void onProgressUpdate(Progress... values) {
  83         super.onProgressUpdate(values);
  84         MainActivity context = getContext();
  85         if (context == null) return;
  86         context.onRetrieveProgress(values[0]);
  87     }
  88     @Override
  89     protected void onPreExecute() {
  90         super.onPreExecute();
  91         MainActivity context = getContext();
  92         if (context == null) return;
  93         context.onRetrieveStart();
  94     }
  95     @Override
  96     protected void onPostExecute(String error) {
  97         super.onPostExecute(error);
  98         MainActivity context = getContext();
  99         if (context == null) return;
 100         context.onRetrieveDone(error);
 101     }
 102     @Override
 103     protected void onCancelled() {
 104         super.onCancelled();
 105         MainActivity context = getContext();
 106         if (context == null) return;
 107         context.onRetrieveDone(null);
 108     }
 109     private String retrieveTransactionListLegacy(MobileLedgerProfile profile)
 110             throws IOException, ParseException, HTTPException {
 111         Progress progress = new Progress();
 112         int maxTransactionId = Progress.INDETERMINATE;
 113         ArrayList<LedgerAccount> accountList = new ArrayList<>();
 114         HashMap<String, Void> accountNames = new HashMap<>();
 115         LedgerAccount lastAccount = null;
 116         boolean onlyStarred = Data.optShowOnlyStarred.get();
 117
 118         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "journal");
 119         http.setAllowUserInteraction(false);
 120         publishProgress(progress);
 121         switch (http.getResponseCode()) {
 122             case 200:
 123                 break;
 124             default:
 125                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 126         }
 127         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 128             try (InputStream resp = http.getInputStream()) {
 129                 if (http.getResponseCode() != 200)
 130                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 131                 db.beginTransaction();
 132                 try {
 133                     prepareDbForRetrieval(db, profile);
 134
 135                     int matchedTransactionsCount = 0;
 136
 137
 138                     ParserState state = ParserState.EXPECTING_ACCOUNT;
 139                     String line;
 140                     BufferedReader buf =
 141                             new BufferedReader(new InputStreamReader(resp, StandardCharsets.UTF_8));
 142
 143                     int processedTransactionCount = 0;
 144                     int transactionId = 0;
 145                     LedgerTransaction transaction = null;
 146                     LINES:
 147                     while ((line = buf.readLine()) != null) {
 148                         throwIfCancelled();
 149                         Matcher m;
 150                         m = reComment.matcher(line);
 151                         if (m.find()) {
 152                             // TODO: comments are ignored for now
 153                             Log.v("transaction-parser", "Ignoring comment");
 154                             continue;
 155                         }
 156                         //L(String.format("State is %d", updating));
 157                         switch (state) {
 158                             case EXPECTING_ACCOUNT:
 159                                 if (line.equals("<h2>General Journal</h2>")) {
 160                                     state = ParserState.EXPECTING_TRANSACTION;
 161                                     L("→ expecting transaction");
 162                                     Data.accounts.set(accountList);
 163                                     continue;
 164                                 }
 165                                 m = reAccountName.matcher(line);
 166                                 if (m.find()) {
 167                                     String acct_encoded = m.group(1);
 168                                     String acct_name = URLDecoder.decode(acct_encoded, "UTF-8");
 169                                     acct_name = acct_name.replace("\"", "");
 170                                     L(String.format("found account: %s", acct_name));
 171
 172                                     lastAccount = profile.tryLoadAccount(db, acct_name);
 173                                     if (lastAccount == null)
 174                                         lastAccount = new LedgerAccount(acct_name);
 175                                     else lastAccount.removeAmounts();
 176                                     profile.storeAccount(db, lastAccount);
 177
 178                                     // make sure the parent account(s) are present,
 179                                     // synthesising them if necessary
 180                                     String parentName = lastAccount.getParentName();
 181                                     if (parentName != null) {
 182                                         Stack<String> toAppend = new Stack<>();
 183                                         while (parentName != null) {
 184                                             if (accountNames.containsKey(parentName)) break;
 185                                             toAppend.push(parentName);
 186                                             parentName =
 187                                                     new LedgerAccount(parentName).getParentName();
 188                                         }
 189                                         while (!toAppend.isEmpty()) {
 190                                             String aName = toAppend.pop();
 191                                             LedgerAccount acc = new LedgerAccount(aName);
 192                                             acc.setHiddenByStar(lastAccount.isHiddenByStar());
 193                                             if ((!onlyStarred || !acc.isHiddenByStar()) &&
 194                                                 acc.isVisible(accountList)) accountList.add(acc);
 195                                             L(String.format("gap-filling with %s", aName));
 196                                             accountNames.put(aName, null);
 197                                             profile.storeAccount(db, acc);
 198                                         }
 199                                     }
 200
 201                                     if ((!onlyStarred || !lastAccount.isHiddenByStar()) &&
 202                                         lastAccount.isVisible(accountList))
 203                                         accountList.add(lastAccount);
 204                                     accountNames.put(acct_name, null);
 205
 206                                     state = ParserState.EXPECTING_ACCOUNT_AMOUNT;
 207                                     L("→ expecting account amount");
 208                                 }
 209                                 break;
 210
 211                             case EXPECTING_ACCOUNT_AMOUNT:
 212                                 m = reAccountValue.matcher(line);
 213                                 boolean match_found = false;
 214                                 while (m.find()) {
 215                                     throwIfCancelled();
 216
 217                                     match_found = true;
 218                                     String value = m.group(1);
 219                                     String currency = m.group(2);
 220                                     if (currency == null) currency = "";
 221                                     value = value.replace(',', '.');
 222                                     L("curr=" + currency + ", value=" + value);
 223                                     profile.storeAccountValue(db, lastAccount.getName(), currency,
 224                                             Float.valueOf(value));
 225                                     lastAccount.addAmount(Float.parseFloat(value), currency);
 226                                 }
 227
 228                                 if (match_found) {
 229                                     state = ParserState.EXPECTING_ACCOUNT;
 230                                     L("→ expecting account");
 231                                 }
 232
 233                                 break;
 234
 235                             case EXPECTING_TRANSACTION:
 236                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 237                                 m = reTransactionStart.matcher(line);
 238                                 if (m.find()) {
 239                                     transactionId = Integer.valueOf(m.group(1));
 240                                     state = ParserState.EXPECTING_TRANSACTION_DESCRIPTION;
 241                                     L(String.format("found transaction %d → expecting description",
 242                                             transactionId));
 243                                     progress.setProgress(++processedTransactionCount);
 244                                     if (maxTransactionId < transactionId)
 245                                         maxTransactionId = transactionId;
 246                                     if ((progress.getTotal() == Progress.INDETERMINATE) ||
 247                                         (progress.getTotal() < transactionId))
 248                                         progress.setTotal(transactionId);
 249                                     publishProgress(progress);
 250                                 }
 251                                 m = reEnd.matcher(line);
 252                                 if (m.find()) {
 253                                     L("--- transaction value complete ---");
 254                                     break LINES;
 255                                 }
 256                                 break;
 257
 258                             case EXPECTING_TRANSACTION_DESCRIPTION:
 259                                 if (!line.isEmpty() && (line.charAt(0) == ' ')) continue;
 260                                 m = reTransactionDescription.matcher(line);
 261                                 if (m.find()) {
 262                                     if (transactionId == 0) throw new TransactionParserException(
 263                                             "Transaction Id is 0 while expecting " + "description");
 264
 265                                     String date = m.group(1);
 266                                     try {
 267                                         int equalsIndex = date.indexOf('=');
 268                                         if (equalsIndex >= 0)
 269                                             date = date.substring(equalsIndex + 1);
 270                                         transaction = new LedgerTransaction(transactionId, date,
 271                                                 m.group(2));
 272                                     }
 273                                     catch (ParseException e) {
 274                                         e.printStackTrace();
 275                                         return String.format("Error parsing date '%s'", date);
 276                                     }
 277                                     state = ParserState.EXPECTING_TRANSACTION_DETAILS;
 278                                     L(String.format("transaction %d created for %s (%s) →" +
 279                                                     " expecting details", transactionId, date,
 280                                             m.group(2)));
 281                                 }
 282                                 break;
 283
 284                             case EXPECTING_TRANSACTION_DETAILS:
 285                                 if (line.isEmpty()) {
 286                                     // transaction data collected
 287                                     if (transaction.existsInDb(db)) {
 288                                         profile.markTransactionAsPresent(db, transaction);
 289                                         matchedTransactionsCount++;
 290
 291                                         if (matchedTransactionsCount ==
 292                                             MATCHING_TRANSACTIONS_LIMIT)
 293                                         {
 294                                             profile.markTransactionsBeforeTransactionAsPresent(db,
 295                                                     transaction);
 296                                             progress.setTotal(progress.getProgress());
 297                                             publishProgress(progress);
 298                                             break LINES;
 299                                         }
 300                                     }
 301                                     else {
 302                                         profile.storeTransaction(db, transaction);
 303                                         matchedTransactionsCount = 0;
 304                                         progress.setTotal(maxTransactionId);
 305                                     }
 306
 307                                     state = ParserState.EXPECTING_TRANSACTION;
 308                                     L(String.format("transaction %s saved → expecting transaction",
 309                                             transaction.getId()));
 310                                     transaction.finishLoading();
 311
 312 // sounds like a good idea, but transaction-1 may not be the first one chronologically
 313 // for example, when you add the initial seeding transaction after entering some others
 314 //                                            if (transactionId == 1) {
 315 //                                                L("This was the initial transaction. Terminating " +
 316 //                                                  "parser");
 317 //                                                break LINES;
 318 //                                            }
 319                                 }
 320                                 else {
 321                                     m = reTransactionDetails.matcher(line);
 322                                     if (m.find()) {
 323                                         String acc_name = m.group(1);
 324                                         String amount = m.group(2);
 325                                         String currency = m.group(3);
 326                                         if (currency == null) currency = "";
 327                                         amount = amount.replace(',', '.');
 328                                         transaction.addAccount(
 329                                                 new LedgerTransactionAccount(acc_name,
 330                                                         Float.valueOf(amount), currency));
 331                                         L(String.format("%d: %s = %s", transaction.getId(),
 332                                                 acc_name, amount));
 333                                     }
 334                                     else throw new IllegalStateException(String.format(
 335                                             "Can't parse transaction %d " + "details: %s",
 336                                             transactionId, line));
 337                                 }
 338                                 break;
 339                             default:
 340                                 throw new RuntimeException(
 341                                         String.format("Unknown parser updating %s", state.name()));
 342                         }
 343                     }
 344
 345                     throwIfCancelled();
 346
 347                     profile.deleteNotPresentTransactions(db);
 348                     db.setTransactionSuccessful();
 349
 350                     profile.setLastUpdateStamp();
 351
 352                     return null;
 353                 }
 354                 finally {
 355                     db.endTransaction();
 356                 }
 357             }
 358         }
 359     }
 360     private void prepareDbForRetrieval(SQLiteDatabase db, MobileLedgerProfile profile) {
 361         db.execSQL("UPDATE transactions set keep=0 where profile=?",
 362                 new String[]{profile.getUuid()});
 363         db.execSQL("update account_values set keep=0 where profile=?;",
 364                 new String[]{profile.getUuid()});
 365         db.execSQL("update accounts set keep=0 where profile=?;", new String[]{profile.getUuid()});
 366     }
 367     private boolean retrieveAccountList(MobileLedgerProfile profile)
 368             throws IOException, HTTPException {
 369         Progress progress = new Progress();
 370
 371         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "accounts");
 372         http.setAllowUserInteraction(false);
 373         switch (http.getResponseCode()) {
 374             case 200:
 375                 break;
 376             case 404:
 377                 return false;
 378             default:
 379                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 380         }
 381         publishProgress(progress);
 382         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 383             try (InputStream resp = http.getInputStream()) {
 384                 if (http.getResponseCode() != 200)
 385                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 386
 387                 db.beginTransaction();
 388                 try {
 389                     profile.markAccountsAsNotPresent(db);
 390
 391                     AccountListParser parser = new AccountListParser(resp);
 392                     ArrayList<LedgerAccount> accountList = new ArrayList<>();
 393
 394                     while (true) {
 395                         throwIfCancelled();
 396                         ParsedLedgerAccount parsedAccount = parser.nextAccount();
 397                         if (parsedAccount == null) break;
 398
 399                         LedgerAccount acc = profile.tryLoadAccount(db, parsedAccount.getAname());
 400                         if (acc == null) acc = new LedgerAccount(parsedAccount.getAname());
 401                         else acc.removeAmounts();
 402
 403                         profile.storeAccount(db, acc);
 404                         for (ParsedBalance b : parsedAccount.getAebalance()) {
 405                             profile.storeAccountValue(db, acc.getName(), b.getAcommodity(),
 406                                     b.getAquantity().asFloat());
 407                         }
 408
 409                         if (acc.isVisible(accountList)) accountList.add(acc);
 410                     }
 411                     throwIfCancelled();
 412
 413                     profile.deleteNotPresentAccounts(db);
 414                     throwIfCancelled();
 415                     db.setTransactionSuccessful();
 416                     Data.accounts.set(accountList);
 417                 }
 418                 finally {
 419                     db.endTransaction();
 420                 }
 421             }
 422         }
 423
 424         return true;
 425     }
 426     private boolean retrieveTransactionList(MobileLedgerProfile profile)
 427             throws IOException, ParseException, HTTPException {
 428         Progress progress = new Progress();
 429         int maxTransactionId = Progress.INDETERMINATE;
 430
 431         HttpURLConnection http = NetworkUtil.prepareConnection(profile, "transactions");
 432         http.setAllowUserInteraction(false);
 433         publishProgress(progress);
 434         switch (http.getResponseCode()) {
 435             case 200:
 436                 break;
 437             case 404:
 438                 return false;
 439             default:
 440                 throw new HTTPException(http.getResponseCode(), http.getResponseMessage());
 441         }
 442         try (SQLiteDatabase db = MLDB.getWritableDatabase()) {
 443             try (InputStream resp = http.getInputStream()) {
 444                 if (http.getResponseCode() != 200)
 445                     throw new IOException(String.format("HTTP error %d", http.getResponseCode()));
 446                 throwIfCancelled();
 447                 db.beginTransaction();
 448                 try {
 449                     profile.markTransactionsAsNotPresent(db);
 450
 451                     int matchedTransactionsCount = 0;
 452                     TransactionListParser parser = new TransactionListParser(resp);
 453
 454                     int processedTransactionCount = 0;
 455
 456                     while (true) {
 457                         throwIfCancelled();
 458                         ParsedLedgerTransaction parsedTransaction = parser.nextTransaction();
 459                         throwIfCancelled();
 460                         if (parsedTransaction == null) break;
 461                         LedgerTransaction transaction = parsedTransaction.asLedgerTransaction();
 462                         if (transaction.existsInDb(db)) {
 463                             profile.markTransactionAsPresent(db, transaction);
 464                             matchedTransactionsCount++;
 465
 466                             if (matchedTransactionsCount == MATCHING_TRANSACTIONS_LIMIT) {
 467                                 profile.markTransactionsBeforeTransactionAsPresent(db, transaction);
 468                                 progress.setTotal(progress.getProgress());
 469                                 publishProgress(progress);
 470                                 db.setTransactionSuccessful();
 471                                 profile.setLastUpdateStamp();
 472                                 return true;
 473                             }
 474                         }
 475                         else {
 476                             profile.storeTransaction(db, transaction);
 477                             matchedTransactionsCount = 0;
 478                             progress.setTotal(maxTransactionId);
 479                         }
 480
 481                         if ((progress.getTotal() == Progress.INDETERMINATE) ||
 482                             (progress.getTotal() < transaction.getId()))
 483                             progress.setTotal(transaction.getId());
 484
 485                         progress.setProgress(++processedTransactionCount);
 486                         publishProgress(progress);
 487                     }
 488
 489                     throwIfCancelled();
 490                     profile.deleteNotPresentTransactions(db);
 491                     throwIfCancelled();
 492                     db.setTransactionSuccessful();
 493                     profile.setLastUpdateStamp();
 494                 }
 495                 finally {
 496                     db.endTransaction();
 497                 }
 498             }
 499         }
 500
 501         return true;
 502     }
 503     @SuppressLint("DefaultLocale")
 504     @Override
 505     protected String doInBackground(Void... params) {
 506         MobileLedgerProfile profile = Data.profile.get();
 507         Data.backgroundTaskCount.incrementAndGet();
 508         try {
 509             if (!retrieveAccountList(profile) || !retrieveTransactionList(profile))
 510                 return retrieveTransactionListLegacy(profile);
 511             return null;
 512         }
 513         catch (MalformedURLException e) {
 514             e.printStackTrace();
 515             return "Invalid server URL";
 516         }
 517         catch (HTTPException e) {
 518             e.printStackTrace();
 519             return String.format("HTTP error %d: %s", e.getResponseCode(), e.getResponseMessage());
 520         }
 521         catch (IOException e) {
 522             e.printStackTrace();
 523             return e.getLocalizedMessage();
 524         }
 525         catch (ParseException e) {
 526             e.printStackTrace();
 527             return "Network error";
 528         }
 529         catch (OperationCanceledException e) {
 530             e.printStackTrace();
 531             return "Operation cancelled";
 532         }
 533         finally {
 534             Data.backgroundTaskCount.decrementAndGet();
 535         }
 536     }
 537     private MainActivity getContext() {
 538         return contextRef.get();
 539     }
 540     private void throwIfCancelled() {
 541         if (isCancelled()) throw new OperationCanceledException(null);
 542     }
 543
 544     private enum ParserState {
 545         EXPECTING_ACCOUNT, EXPECTING_ACCOUNT_AMOUNT, EXPECTING_JOURNAL, EXPECTING_TRANSACTION,
 546         EXPECTING_TRANSACTION_DESCRIPTION, EXPECTING_TRANSACTION_DETAILS
 547     }
 548
 549     public class Progress {
 550         public static final int INDETERMINATE = -1;
 551         private int progress;
 552         private int total;
 553         Progress() {
 554             this(INDETERMINATE, INDETERMINATE);
 555         }
 556         Progress(int progress, int total) {
 557             this.progress = progress;
 558             this.total = total;
 559         }
 560         public int getProgress() {
 561             return progress;
 562         }
 563         protected void setProgress(int progress) {
 564             this.progress = progress;
 565         }
 566         public int getTotal() {
 567             return total;
 568         }
 569         protected void setTotal(int total) {
 570             this.total = total;
 571         }
 572     }
 573
 574     private class TransactionParserException extends IllegalStateException {
 575         TransactionParserException(String message) {
 576             super(message);
 577         }
 578     }
 579 }